/***************************************************************************/
/* */
/* gxvmort1.c */
/* */
/* TrueTypeGX/AAT mort table validation */
/* body for type1 (Contextual Substitution) subtable. */
/* */
/* Copyright 2005, 2007 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
/***************************************************************************/
/* */
/* gxvalid is derived from both gxlayout module and otvalid module. */
/* Development of gxlayout is supported by the Information-technology */
/* Promotion Agency(IPA), Japan. */
/* */
/***************************************************************************/
#include "gxvmort.h"
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_gxvmort
typedef struct GXV_mort_subtable_type1_StateOptRec_
{
FT_UShort substitutionTable;
FT_UShort substitutionTable_length;
} GXV_mort_subtable_type1_StateOptRec,
*GXV_mort_subtable_type1_StateOptRecData;
#define GXV_MORT_SUBTABLE_TYPE1_HEADER_SIZE \
( GXV_STATETABLE_HEADER_SIZE + 2 )
static void
gxv_mort_subtable_type1_substitutionTable_load( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
GXV_mort_subtable_type1_StateOptRecData optdata =
(GXV_mort_subtable_type1_StateOptRecData)valid->statetable.optdata;
GXV_LIMIT_CHECK( 2 );
optdata->substitutionTable = FT_NEXT_USHORT( p );
}
static void
gxv_mort_subtable_type1_subtable_setup( FT_UShort table_size,
FT_UShort classTable,
FT_UShort stateArray,
FT_UShort entryTable,
FT_UShort* classTable_length_p,
FT_UShort* stateArray_length_p,
FT_UShort* entryTable_length_p,
GXV_Validator valid )
{
FT_UShort o[4];
FT_UShort *l[4];
FT_UShort buff[5];
GXV_mort_subtable_type1_StateOptRecData optdata =
(GXV_mort_subtable_type1_StateOptRecData)valid->statetable.optdata;
o[0] = classTable;
o[1] = stateArray;
o[2] = entryTable;
o[3] = optdata->substitutionTable;
l[0] = classTable_length_p;
l[1] = stateArray_length_p;
l[2] = entryTable_length_p;
l[3] = &( optdata->substitutionTable_length );
gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, valid );
}
static void
gxv_mort_subtable_type1_offset_to_subst_validate(
FT_Short wordOffset,
const FT_String* tag,
FT_Byte state,
GXV_Validator valid )
{
FT_UShort substTable;
FT_UShort substTable_limit;
FT_UShort min_gid;
FT_UShort max_gid;
FT_UNUSED( tag );
FT_UNUSED( state );
substTable =
((GXV_mort_subtable_type1_StateOptRec *)
(valid->statetable.optdata))->substitutionTable;
substTable_limit =
(FT_UShort)( substTable +
((GXV_mort_subtable_type1_StateOptRec *)
(valid->statetable.optdata))->substitutionTable_length );
min_gid = (FT_UShort)( ( substTable - wordOffset * 2 ) / 2 );
max_gid = (FT_UShort)( ( substTable_limit - wordOffset * 2 ) / 2 );
max_gid = (FT_UShort)( FT_MAX( max_gid, valid->face->num_glyphs ) );
/* XXX: check range? */
/* TODO: min_gid & max_gid comparison with ClassTable contents */
}
static void
gxv_mort_subtable_type1_entry_validate(
FT_Byte state,
FT_UShort flags,
GXV_StateTable_GlyphOffsetCPtr glyphOffset_p,
FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_UShort setMark;
FT_UShort dontAdvance;
FT_UShort reserved;
FT_Short markOffset;
FT_Short currentOffset;
FT_UNUSED( table );
FT_UNUSED( limit );
setMark = (FT_UShort)( flags >> 15 );
dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
reserved = (FT_Short)( flags & 0x3FFF );
markOffset = (FT_Short)( glyphOffset_p->ul >> 16 );
currentOffset = (FT_Short)( glyphOffset_p->ul );
if ( 0 < reserved )
{
GXV_TRACE(( " non-zero bits found in reserved range\n" ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_DATA;
}
gxv_mort_subtable_type1_offset_to_subst_validate( markOffset,
"markOffset",
state,
valid );
gxv_mort_subtable_type1_offset_to_subst_validate( currentOffset,
"currentOffset",
state,
valid );
}
static void
gxv_mort_subtable_type1_substTable_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_UShort num_gids = (FT_UShort)(
((GXV_mort_subtable_type1_StateOptRec *)
(valid->statetable.optdata))->substitutionTable_length / 2 );
FT_UShort i;
GXV_NAME_ENTER( "validating contents of substitutionTable" );
for ( i = 0; i < num_gids ; i ++ )
{
FT_UShort dst_gid;
GXV_LIMIT_CHECK( 2 );
dst_gid = FT_NEXT_USHORT( p );
if ( dst_gid >= 0xFFFFU )
continue;
if ( dst_gid > valid->face->num_glyphs )
{
GXV_TRACE(( "substTable include too large gid[%d]=%d >"
" max defined gid #%d\n",
i, dst_gid, valid->face->num_glyphs ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_GLYPH_ID;
}
}
GXV_EXIT;
}
/*
* subtable for Contextual glyph substitution is a modified StateTable.
* In addition to classTable, stateArray, and entryTable, the field
* `substitutionTable' is added.
*/
FT_LOCAL_DEF( void )
gxv_mort_subtable_type1_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
GXV_mort_subtable_type1_StateOptRec st_rec;
GXV_NAME_ENTER( "mort chain subtable type1 (Contextual Glyph Subst)" );
GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE1_HEADER_SIZE );
valid->statetable.optdata =
&st_rec;
valid->statetable.optdata_load_func =
gxv_mort_subtable_type1_substitutionTable_load;
valid->statetable.subtable_setup_func =
gxv_mort_subtable_type1_subtable_setup;
valid->statetable.entry_glyphoffset_fmt =
GXV_GLYPHOFFSET_ULONG;
valid->statetable.entry_validate_func =
gxv_mort_subtable_type1_entry_validate;
gxv_StateTable_validate( p, limit, valid );
gxv_mort_subtable_type1_substTable_validate(
table + st_rec.substitutionTable,
table + st_rec.substitutionTable + st_rec.substitutionTable_length,
valid );
GXV_EXIT;
}
/* END */